title: Effects of polychlorinated biphenyls and environmental biotransformation products on aquatic nitrification.
abstract: The effects of polychlorinated biphenyls (PCBs) on nitrification were examined for pure cultures and natural reservoir samples. PCBs at concentrations greater than 10 microgram liter-1 inhibited nitrification, principally ammonium oxidation, in one of two natural reservoir environments. However, this inhibition could not be reproduced in pure high-cell-density cultures or in previously contaminated reservoir waters. A PCB environmental biotransformation product, p-chlorophenylglyoxylic acid, and p-chloromandelic acid had no effect on nitrification.
mesh_terms: D001711:Biotransformation; D007700:Kinetics; D009576:Nitrobacter / Q000187:drug effects / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D009606:Nitrosomonas / Q000187:drug effects / Q000378:metabolism*; D011078:Polychlorinated Biphenyls / Q000494:pharmacology*; D014871:Water Microbiology
chemical_list: D011078:Polychlorinated Biphenyls; D009584:Nitrogen